I have a nice Televue 1.25" mirror diagonal (non-Everbright) that is in nearly new condition. Very minor scuff marks on heavy chrome barrel from OTA set screw.
Barrel blackened and threaded. Pristine optics.
Al Nagler's comments on the specs of this diagonal:
John asks if our 1.25" diagonals are purchased from Japan.
Yes. While you may find similar looking products elsewhere, ours are 100% optically tested here, the reflectivity is 93% and we include a captive lock screw. I don't think any look-alike has these attributes.